<template>
  <view>
	<view class="search-box">
		 <uni-search-bar  @input="input" :radius="100" placeholder="自定义搜索内容" 
     cancelButton="none" :focus="true"></uni-search-bar>
	</view>
  <!-- 搜索结果 -->
  <view class="sugg-list" v-if="searchResults.length !== 0">
     <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">
           {{item.goods_name}} 
        </view>
           <uni-icons type="arrowright" size="16"></uni-icons>
     </view>
  </view>

   <!-- 搜索历史 -->
   <view class="history-box" v-else>
      <!-- 搜索标题 -->
      <view class="history-title">
         <text>搜索历史</text>
         <uni-icons type="trash" size="16" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
         <uni-tag :text="item" v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
   </view>
</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
        kw:'',
        searchResults:[],
        historyList:['a','app','apple']
			};
		},
    methods:{
      input(res){
         // console.log('input:',res.value)
         clearTimeout(this.timer)
         this.timer = setTimeout(()=>{
            this.kw = res.value
             // console.log(this.kw)
             this.getSearchList()
          },500)
        },
        async getSearchList(){
          if(this.kw===''){
            this.searchResults=[]
            return
          }
           const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
           if(res.meta.status !==200) return uni.$showMsg()
           this.searchResults = res.message
           
           this.saveSearchHistory()
        },
         // 2. 保存搜索关键词的方法
        saveSearchHistory() {
            // 2.1 直接把搜索关键词 push 到 historyList 数组中
            // this.historyList.push(this.kw)
            // 1. 将 Array 数组转化为 Set 对象
            const set= new Set(this.historyList)
             // 2. 调用 Set 对象的 delete 方法，移除对应的元素
            set.delete(this.kw)
            // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
            set.add(this.kw)
             // 4. 将 Set 对象转化为 Array 数组
            this.historyList = Array.from(set)
            
              // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
             uni.setStorageSync('kw',JSON.stringify(this.historyList))
          },
          gotoDetail(item){
            console.log(item.goods_id)
            uni.navigateTo({
              url:'/subpkg/goods_detail/goods_detail?goods_id=' +item.goods_id
            })
          },
          cleanHistory(){
            this.historyList =[]
            uni.setStorageSync('kw','[]')
          },
          gotoGoodsList(kw){
            uni.navigateTo({
              url:"/subpkg/goods_list/goods_list?query=" +kw
            })
          }
    },
    computed:{
      historys(){
        return [...this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList =JSON.parse(uni.getStorageSync('kw') || '[]')
    }
	}
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding:0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      //文字不允许换行
      white-space: nowrap;
      //超出隐藏
      overflow: hidden;
      // 超出用...表示
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box{
  padding: 0 5px;
  .history-title{
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    margin-top: 5px;
    
    .uni-tag{
      margin-right: 5px;
    }
  }
}
</style>
